Patent US2991254A successfully refreshed from Google Patents.
US2991254A
Expired / Lapsed
US
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Composition for engine deposit removal
Assignee: Sunoco Inc
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Filing: 1958-02-11
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Granted: 1961-07-04
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Expires: 1978-02-11
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul E Oberdorfer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:20
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C07; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/32; C07D317/34; C07D317/36; C10; C10L; C10L10/00; C10L10/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A SOLVENT COMPOSITION FOR THE REMOVAL OF LEAD-CONTAINING ENGINE DEPOSITS WHICH CONSISTS ESSENTIALLY OF: FROM ABOUT 25 TO ABOUT 75 VOLUME PERCENT OF A CYCLIC CARBONATE INNER ESTER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE CARBONATE, PROPYLENE CARBONATE, BUTYLENE CARBONATE, AND AMYLENE CARBONATE, FROM ABOUT 10 TO ABOUT 50 VOLUME PERCENT OF WATER, AND FROM ABOUT 10 TO ABOUT 25 VOLUME PERCENT OF A MUTUAL SOLVENT FOR THE CARBONATE INNER ESTER AND THE WATER, SAID SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ISOPROPANOL, ACETONE, DIMETHYL ACETAL AND METHYL ETHYL KETONE.
Claim 2
Dependent Claim
93 words
A SOLVENT COMPOSITION FOR THE REMOVAL OF LEAD-CONTAINING ENGINE DEPOSITS WHICH CONSISTS ESSENTIALLY OF: FROM ABOUT 25 TO ABOUT 75 VOLUME PERCENT OF A CYCLIC CARBONATE INNER ESTER SELECTED FROM THE GROUP CONSISTING OF ETHYLENE CARBONATE, PROPYLENE CARBONATE, BUTYLENE CARBONATE, AND AMYLENE CARBONATE, FROM ABOUT 10 TO ABOUT 50 VOLUME PERCENT OF WATER, AND FROM ABOUT 10 TO ABOUT 25 VOLUME PERCENT OF A MUTUAL SOLVENT FOR THE CARBONATE INNER ESTER AND THE WATER, SAID SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ISOPROPANOL, ACETONE, DIMETHYL ACETAL AND METHYL ETHYL KETONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |